CN103628467A - Foundation treatment method based on dynamic accurate control on nonuniform settlement - Google Patents
Foundation treatment method based on dynamic accurate control on nonuniform settlement Download PDFInfo
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- CN103628467A CN103628467A CN201310720596.8A CN201310720596A CN103628467A CN 103628467 A CN103628467 A CN 103628467A CN 201310720596 A CN201310720596 A CN 201310720596A CN 103628467 A CN103628467 A CN 103628467A
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Abstract
The invention discloses a foundation treatment method based on dynamic accurate control on nonuniform settlement. The method comprises the steps of (1) prefabricating a permeable pile, wherein a pile body is a hollow pipe pile; (2) connecting a pipe cap with a drain pipe, connecting the pipe cap with the prefabricated permeable pile hermetically, and driving the pile body to a position below the ground water level of a foundation; (3) dividing a treatment area of the foundation into unit areas, and configuring a vacuum draining pump for each unit area; (4) arranging a vacuum pipe network, ditching on the spot to bury all pipe sections into the foundation, and connecting an external interface with the vacuum draining pump; (5) arranging a mattress layer between a composite foundation and a base; (6) building the base, and then performing construction of an upper structure; (7) when nonuniform settlement of the foundation appears during building settlement, controlling the vacuum degree of different unit areas in the foundation by using the unit areas divided in the step (3) and the configured vacuum draining pump. By adopting the foundation treatment method disclosed by the invention, the settling amounts of different areas of the foundation are accurately controlled, and problems caused by nonuniform settlement are solved.
Description
Technical field
The present invention proposes a kind of method of dynamically accurately controlling uneven settlement of foundation, belong to field of civil engineering.
Background technology
Ground plays very important effect in building, and the quality of ground and the safety of building have close relationship.Ground, owing to being subject to the impact of the many factors such as geological condition, design and construction, easily produces differential settlement, thereby causes inclination, the cracking of building, and these are Common Accidents in engineering.Once the accident of ground occurs, and is just difficult to remedy,, there is uncontrollable processing of differential settlement in CFG pile composite foundation engineering for example in work progress.How in building body infall process, accurately to control the differential settlement of ground, guarantee that the Form of Architecture of building and safety become a difficult problem.
Summary of the invention
The problem existing in order to solve prior art, the present invention specifically discloses a kind of method for processing foundation the method for dynamically accurately controlling based on differential settlement, by controlling the situation of zones of different vacuum in ground and then controlling settlement of foundation, can accurately process the problem that building body infall process is caused by uneven settlement of foundation, and during the phenomenons such as the building inclination that can occur being caused by uneven settlement of foundation in work progress and settlement after construction process, ground cracking, utilize the method to control uneven settlement of foundation, make engineering return normal condition.
In order to realize above-mentioned target, the technical solution used in the present invention is as follows:
The method for processing foundation of dynamically accurately controlling based on differential settlement, comprises the following steps:
Step (1) makes permeable stake, and pile body is hollow pile tube, with pile cover, and can strictly seal with pile body;
Step (2) connects gutter by pile cover, and connects with prefabricated permeable pile weatherstrip, and pile body is squeezed into below ground groundwater table;
The processing region division unit region of step (3) ground, each unit area is comprised of adjacent a plurality of pile bodies, and a vacuum drainage pump of each unit area configuration;
Step (4) is arranged vacuum pipe network, and lays, connects after vacuum pipe network, and ditching is all imbedded tube coupling in ground on the spot, and external interface is connected with vacuum drainage pump;
Step (5) arranges mattress layer between composite foundation and basis,
Step (6) is built basis, then carries out the construction of superstructure;
While there is uneven settlement of foundation phenomenon in step (7) building settlement process, by the unit area of division in step (3) and the vacuum drainage pump of configuration, the control of realization to different units region vacuum in ground, thereby accurately control the settling amount of ground zones of different, solve the problem that differential settlement causes.
The described pile cover top of step (1) has the circular hole of diameter 30～60mm; Strength of the mixing pile is 15MPa～30MPa, and transmission coefficient is 0.01mm/s～5.4mm/s, and 350～600mm is got in stake footpath, and pile wall thickness is got 100～200mm, and pile body length is 10 m～20 m.
The spacing of the permeable stake that step (2) is described is 1.0 m～2.5 m.
Each unit area of step (3) is comprised of 8～20 adjacent pile bodies
Pipe network described in step (3) forms by being responsible for arm, select and have some strength and flexible PVC plastic pipe, supervisor's caliber is 60 mm～90 mm, and wall thickness is 2.4 mm～3.5 mm, branch diameter 30 mm～60 mm, wall thickness is 2.0 mm～2.5 mm.Between supervisor and arm, adopt reducing tee, four-way to be connected, with the docking of caliber, adopt the connection of twine sebific duct.
The desirable 150 mm～300mm of mattress layer thickness described in step (5).Mattress layer material can be selected medium coarse sand, graded sand and stone etc., and maximum particle diameter should not be greater than 20mm, and the coefficient of consolidation of mattress layer is 0.9～0.98.
Described stake footpath refers to the diameter of stake, and described caliber is diameter.
beneficial effect of the present invention is as follows:
(1) intensity and the rigidity of permeable stake are large, have advantages of rigid pile, have improved greatly bearing capacity of foundation soil; And permeable stake has good water permeability, transmission coefficient is large, and drainage speed is fast, squeezes in ground and forms drainage channel, the excess pore water pressure that the ground that can dissipate fast produces in work progress.Because pile body has concurrently together with intensity greatly makes the transmission of overlying burden power in pile body and the discharging consolidation PROCESS COUPLING of ground with the advantage of good water permeability, mutually promote, accelerated ground consolidation speed, reduced settlement after construction.Meanwhile, due to the good water permeability of water permeability stake, can well prevent seismic foundation liquefaction.
(2) vacuum action by vacuum drainage pump applies fluid pressure (negative pressure) to ground, and by transmitting the permeable pile tube of fluid pressure, in the short period of time its role and influence are from the close-by examples to those far off extended to pile body region around, join together in the influence area of final each pile body, fluid pressure also reaches dynamic equilibrium.By the fine adjustment to vacuum in each permeable pile tube, can grasp the size of the negative pore water pressure in full wafer region, control the dissipation degree of excess pore water pressure, thereby reach the accurate control to the foundation settlement in full wafer region.
(3) as shown in Figure 1, by composite foundation division unit region, a vacuum drainage pump of each unit area configuration.By the vacuum of each pile tube in accurate control module region, realize the accurate control to unit area vacuum; By the vacuum of each unit area of accurate control, realize the accurate control to the foundation settlement of building lot zones of different, therefore, the method can accurately be processed the problem being caused by uneven settlement of foundation in practice of construction.As shown in Figure 2, when the situation of the building inclination that middle appearance causes by uneven settlement of foundation is carried out in construction, because right side sedimentation is serious, so improve the vacuum in left cell region, increase the leftwards settling amount of base region, thereby adjust building body angle of inclination, make building return normal condition.
Accompanying drawing explanation
The division figure of Fig. 1 control module;
In Fig. 2 construction, building body tilts to scheme;
The distribution of pile body and pipe net arrangement schematic diagram in Fig. 3 unit area;
In figure: 1 unit area, the 2 permeable village, 3 vacuum drainage pumps, 4 vacuum pipe networks.
Concrete implementation step
The method for processing foundation of dynamically accurately controlling based on differential settlement, comprises the following steps:
Step (1) makes permeable stake 2, and pile body is hollow pile tube, with pile cover, can strictly seal with pile body, and pile cover top has the circular hole of diameter 30～60mm; Strength of the mixing pile is 15MPa～30MPa, and transmission coefficient is 0.01mm/s～5.4mm/s, and 350～600mm is got in stake footpath, and pile wall thickness is got 100～200mm, and pile body length is 10 m～20 m.
Step (2) connects gutter (arm of vacuum pipe network 4) by pile cover and connects with prefabricated permeable pile weatherstrip, and pile body is squeezed into below ground groundwater table, and spacing is 1.0 m～2.5 m.
The processing region division unit region of step (3) ground, each unit area 1 is comprised of 8～20 adjacent pile bodies, and configures a vacuum drainage pump 3.
Step (4) is arranged vacuum pipe network 4, and this pipe network forms by being responsible for arm, selects and has some strength and flexible PVC plastic pipe, supervisor's caliber is 60 mm～90 mm, wall thickness is not less than 2.4 mm, branch diameter 30 mm～60 mm, and wall thickness is not less than 2.0 mm.Between supervisor and arm, adopt reducing tee, four-way to be connected, with the docking of caliber, adopt the connection of twine sebific duct.Lay, connect after vacuum pipe network, ditching is all imbedded tube coupling in ground on the spot, and external interface is connected with vacuum drainage pump.
Step (5) arranges mattress layer between composite foundation and basis, the desirable 150 mm～300mm of mattress layer thickness.Mattress layer material can be selected medium coarse sand, graded sand and stone etc., and maximum particle diameter should not be greater than 20mm, and the coefficient of consolidation of mattress layer should not be less than 0.9.
Step (6) is built suitable basis according to requirement of engineering, then carries out the construction of superstructure.
While there is uneven settlement of foundation phenomenon in step (7) building settlement process, improve the vacuum of the unit area that settling amount is less, by the observation to the control of vacuum in ground and externally measured instrument, accurately control settlement of foundation, solve the problem that differential settlement causes.
example one:
Somewhere natural ground bearing stratum (crust layer) is thinner, buried depth is the Muddy Bottoms cohesive soil of high-compressibility, high sensitivity, low-intensity, hypotonicity at the soil of 4 m～20 m left and right, water content is high, porosity is large, and modulus of compressibility of soil is little, and thickness is at 10 m～25 m, it is the main weak substratum of natural ground, now long 38m need be built on this basis, wide 21m, the residential building of high 32m.Because bearing stratum is thinner, lower sleeping soft layer is thicker, so, in order to improve bearing capacity of foundation soil, and the problem that accurately Ground Treatment differential settlement causes, can adopt the method for processing foundation of dynamically accurately controlling based on differential settlement to process this class requirement of engineering.
Permeable pile body adopts pile tube to arrange, pile cover is connected to gutter (arm of vacuum pipe network) and connect with prefabricated permeable pile weatherstrip, and pile body is squeezed into below ground groundwater table.Ground division unit region, each unit area is comprised of 8～20 adjacent pile bodies, and configures a vacuum drainage pump.Arrange vacuum pipe network, between supervisor and arm, adopt reducing tee, four-way to be connected, with the docking of caliber, adopt the connection of twine sebific duct.Lay, connect after vacuum pipe network, ditching is all imbedded tube coupling in ground on the spot, and external interface is connected with vacuum drainage pump.Lay mattress layer, build basis, then carry out Superstructure Construction.When there is uneven subsidence in engineering, improve the vacuum of the unit area that settlement of foundation is less, accurately control settlement of foundation, solve the problem that differential settlement causes.
During construction, all pile body error of perpendicularitys are not more than 1.5%.All pile body diameters are identical, and 350～600mm is got in stake footpath, pile wall thickness 100～200mm, and length 10 m～20 m, pile body compressive strength is not less than 15MPa, and transmission coefficient is not less than 0.01mm/s.Pile body spacing is 1.0 m～2.5 m.Vacuum tube host caliber is 60 mm～90 mm, and wall thickness is not less than 2.4 mm, chimney filter caliber 30 mm～60 mm, and wall thickness is not less than 2.0 mm.
example two:
Certain unit 5 layers of Building 1 brick is mixed frame construction office building, planar dimension approximately 76 * 18 m, and building area is 3 900 m
2.Geological condition is miscellaneous fill, silt clay, Muddy Bottoms silty clay, silt clay and silty clay from top to bottom, wherein, Muddy Bottoms silty clay is stream and moulds state, thickness 2.4～3.6m, the silt clay maximum ga(u)ge 2.5m of lower floor, silty clay thickness 3.5m～5.2m.For the problem of preventing to cause with Ground Treatment differential settlement, can adopt the method for processing foundation of dynamically accurately controlling based on differential settlement to process this ground.
Permeable pile body adopts pile tube to arrange, pile cover is connected to gutter (arm of vacuum pipe network) and connect with prefabricated permeable pile weatherstrip, and pile body is squeezed into below ground groundwater table.Ground division unit region, each unit area is comprised of 8～20 adjacent pile bodies, and configures a vacuum drainage pump.Arrange vacuum pipe network, between supervisor and arm, adopt reducing tee, four-way to be connected, with the docking of caliber, adopt the connection of twine sebific duct.Lay, connect after vacuum pipe network, ditching is all imbedded tube coupling in ground on the spot, and external interface is connected with vacuum drainage pump.Lay mattress layer, build basis, then carry out Superstructure Construction.When there is uneven subsidence in engineering, accurately control the vacuum of each unit area, solve the problem that differential settlement causes.
During construction, all pile body error of perpendicularitys are not more than 1.5%.All pile body diameters are identical, and 300～800mm is got in stake footpath, pile wall thickness 100～300mm, and length 10 m～20 m, pile body compressive strength is not less than 15MPa, and transmission coefficient is not less than 0.01mm/s.Pile body spacing is 1.0 m～3.5 m.Vacuum tube host caliber is 60 mm～90 mm, and wall thickness is not less than 2.4 mm, chimney filter caliber 30 mm～60 mm, and wall thickness is not less than 2.0 mm.
Claims (6)
1. the method for processing foundation of dynamically accurately controlling based on differential settlement, is characterized in that, comprises the following steps:
Step (1) makes permeable stake, and pile body is hollow pile tube, with pile cover, and can strictly seal with pile body;
Step (2) connects gutter by pile cover, and connects with prefabricated permeable pile weatherstrip, and pile body is squeezed into below ground groundwater table;
The processing region division unit region of step (3) ground, each unit area is comprised of adjacent a plurality of pile bodies, and a vacuum drainage pump of each unit area configuration;
Step (4) is arranged vacuum pipe network, and lays, connects after vacuum pipe network, and ditching is all imbedded tube coupling in ground on the spot, and external interface is connected with vacuum drainage pump;
Step (5) arranges mattress layer between composite foundation and basis;
Step (6) is built basis, then carries out the construction of superstructure;
While there is uneven settlement of foundation phenomenon in step (7) building settlement process, by the unit area of division in step (3) and the vacuum drainage pump of configuration, the control of realization to different units region vacuum in ground, thereby accurately control the settling amount of ground zones of different, solve the problem that differential settlement causes.
2. the method for processing foundation of dynamically accurately controlling based on differential settlement as claimed in claim 1, is characterized in that,
The described pile cover top of step (1) has the circular hole of diameter 30～60mm; Strength of the mixing pile is 15MPa～30MPa, and transmission coefficient is 0.01mm/s～5.4mm/s, and 350～600mm is got in stake footpath, and pile wall thickness is got 100～200mm, and pile body length is 10 m～20 m.
3. the method for processing foundation of dynamically accurately controlling based on differential settlement as claimed in claim 1, is characterized in that, the spacing of the permeable stake that step (2) is described is 1.0 m～2.5 m.
4. the method for processing foundation of dynamically accurately controlling based on differential settlement as claimed in claim 1, is characterized in that, each unit area of step (3) is comprised of 8～20 adjacent pile bodies.
5. as claimed in claim 1 based on the dynamic method for processing foundation of accurately controlling of differential settlement, it is characterized in that, pipe network described in step (3) forms by being responsible for arm, select PVC plastic pipe, supervisor's caliber is 60 mm～90 mm, wall thickness is 2.4 mm～3.5 mm, branch diameter 30 mm～60 mm, and wall thickness is 2.0 mm～2.5 mm; Between supervisor and arm, adopt reducing tee, four-way to be connected, with the docking of caliber, adopt the connection of twine sebific duct.
6. the method for processing foundation of dynamically accurately controlling based on differential settlement as claimed in claim 1, is characterized in that, the mattress layer thickness described in step (5) is got 150 mm～300mm; Mattress layer material selection medium coarse sand or graded sand and stone, maximum particle diameter is not more than 20mm, and the coefficient of consolidation of mattress layer is 0.9～0.98.
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Cited By (3)
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| CN109098753A (en) * | 2018-08-09 | 2018-12-28 | 中国矿业大学 | A kind of shallow coal scam diving leakage causes the division methods of calamity degree |
| CN113175004A (en) * | 2021-04-25 | 2021-07-27 | 中国长江三峡集团有限公司 | Anti-scouring device and method for offshore wind power single-pile foundation |
| CN114297742A (en) * | 2021-11-22 | 2022-04-08 | 浙江杰地建筑设计有限公司 | Anti-liquefaction processing method based on average seismic subsidence and differential seismic subsidence |
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| CN202148522U (en) * | 2011-07-04 | 2012-02-22 | 绍兴文理学院 | Soft soil foundation long concrete short gravel (LCSG) pile and vacuum preloading joint treatment device |
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| JP2001214451A (en) * | 2000-02-02 | 2001-08-07 | Kanpai Co Ltd | Ground-water level lowering method and its equipment |
| CN102061691A (en) * | 2009-11-12 | 2011-05-18 | 任再永 | Construction method for treating foundation through filling by adopting draining pile tubes |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109098753A (en) * | 2018-08-09 | 2018-12-28 | 中国矿业大学 | A kind of shallow coal scam diving leakage causes the division methods of calamity degree |
| CN113175004A (en) * | 2021-04-25 | 2021-07-27 | 中国长江三峡集团有限公司 | Anti-scouring device and method for offshore wind power single-pile foundation |
| CN113175004B (en) * | 2021-04-25 | 2022-06-07 | 中国长江三峡集团有限公司 | Anti-scouring device and method for offshore wind power single-pile foundation |
| CN114297742A (en) * | 2021-11-22 | 2022-04-08 | 浙江杰地建筑设计有限公司 | Anti-liquefaction processing method based on average seismic subsidence and differential seismic subsidence |
| CN114297742B (en) * | 2021-11-22 | 2024-08-13 | 杰地设计集团有限公司 | Liquefaction resistance treatment method based on average shock subsidence and differential shock subsidence |
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